What are the differences between tissues and organs?

Question

Accepted Answer

Basis of differentiation
Tissues
Organs

Definition
Tissues are groups of specialized cells that are similar in structure and function together as a unit
Organs are made of tissues. They are a self-contained part of an organism that have a vital and very specific function in the body.

Components
Tissues are composed of cells that are similar in structure and function.
Organs may be composed of several different types of tissues.

Structure
Tissues are evenly distributed structures.
Organs are hollow structures.

Complexity
Tissues perform a single, relatively simple function in the body.
Organs are capable of performing different types of complex functions in the body.

Significance
Tissues are major structural components of organs – they form organs.
Organs are the structural components of the organ system in the body.

Functions
Tissues may have unique functions such as protection, movement, communication, or secretion depending on where they occur. 
Every organ has a unique and vital physiological function in the body.

Repair
Tissues can be repaired via regeneration and fibrosis.
Repairing the tissues helps to repair the organs as well.

Examples
Examples include epithelial tissue, nerve tissue, muscular tissue, connective tissue, and ground tissue. 
Examples include heart, lungs, kidneys, stomach, and intestines.

Basis of differentiation	Tissues	Organs
Definition	Tissues are groups of specialized cells that are similar in structure and function together as a unit	Organs are made of tissues. They are a self-contained part of an organism that have a vital and very specific function in the body.
Components	Tissues are composed of cells that are similar in structure and function.	Organs may be composed of several different types of tissues.
Structure	Tissues are evenly distributed structures.	Organs are hollow structures.
Complexity	Tissues perform a single, relatively simple function in the body.	Organs are capable of performing different types of complex functions in the body.
Significance	Tissues are major structural components of organs – they form organs.	Organs are the structural components of the organ system in the body.
Functions	Tissues may have unique functions such as protection, movement, communication, or secretion depending on where they occur.	Every organ has a unique and vital physiological function in the body.
Repair	Tissues can be repaired via regeneration and fibrosis.	Repairing the tissues helps to repair the organs as well.
Examples	Examples include epithelial tissue, nerve tissue, muscular tissue, connective tissue, and ground tissue.	Examples include heart, lungs, kidneys, stomach, and intestines.

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